Class DelayedIteration<E,X extends Exception>
- java.lang.Object
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- org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E,X>
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- org.eclipse.rdf4j.common.iteration.DelayedIteration<E,X>
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- All Implemented Interfaces:
AutoCloseable,CloseableIteration<E,X>,Iteration<E,X>
- Direct Known Subclasses:
OrderIterator,QueryEvaluationStep.DelayedEvaluationIteration
@Deprecated(since="4.1.0") public abstract class DelayedIteration<E,X extends Exception> extends AbstractCloseableIteration<E,X>
Deprecated.An iteration that delays the creation of the underlying iteration until it is being accessed. This is mainly useful for situations where iteration creation adds considerable overhead but where the iteration may not actually be used, or where a created iteration consumes scarce resources like JDBC-connections or memory. Subclasses must implement the createIteration method, which is called once when the iteration is first needed.
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Constructor Summary
Constructors Modifier Constructor Description protectedDelayedIteration()Deprecated.Creates a new DelayedIteration.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods Modifier and Type Method Description protected abstract Iteration<? extends E,? extends X>createIteration()Deprecated.Creates the iteration that should be iterated over.protected voidhandleClose()Deprecated.Closes this iteration as well as the underlying iteration if it has already been created and happens to be aCloseableIteration.booleanhasNext()Deprecated.Calls the hasNext method of the underlying iteration.Enext()Deprecated.Calls the next method of the underlying iteration.voidremove()Deprecated.Calls the remove method of the underlying iteration.-
Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration
close, isClosed
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration
stream
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Method Detail
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createIteration
protected abstract Iteration<? extends E,? extends X> createIteration() throws X extends Exception
Deprecated.Creates the iteration that should be iterated over. This method is called only once, when the iteration is first needed.
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hasNext
public boolean hasNext() throws X extends ExceptionDeprecated.Calls the hasNext method of the underlying iteration.
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next
public E next() throws X extends Exception
Deprecated.Calls the next method of the underlying iteration.
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remove
public void remove() throws X extends ExceptionDeprecated.Calls the remove method of the underlying iteration.
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handleClose
protected void handleClose() throws X extends ExceptionDeprecated.Closes this iteration as well as the underlying iteration if it has already been created and happens to be aCloseableIteration.- Overrides:
handleClosein classAbstractCloseableIteration<E,X extends Exception>- Throws:
XX extends Exception
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